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Re: [PATCH v3 3/4] x86/livepatch: introduce a basic live patch test to gitlab CI
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 14 Dec 2023 13:55:57 +0100
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- Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 14 Dec 2023 12:56:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.12.2023 11:17, Roger Pau Monne wrote:
> Introduce a basic livepatch test using the interface to run self modifying
> tests. The introduced test relies on changing a function from returning false
> to returning true.
>
> To simplify the burden of keeping a patch that can be provided to
> livepatch-build-tools, introduce two new files: one containing the unpatched
> test functions, and another one that contains the patched forms of such
> functions. Note that only the former is linked into the Xen image, the latter
> is built but the object file is not consumed afterwards. Do this to assert
> that the file containing the patched functions continues to build.
>
> Since livepatch testing will ensure that the functions are not patched
> previous
> the applying the livepatch, allow the livepatch related tests to fail without
> tainting the hypervisor.
>
> Note the livepatch tests are not run as part of the self modifying checks
> executed during boot, as they would obviously fail.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
I'm still not overly happy with those comments though, but yes - -O2 is likely
the only thing that matters in practice, until such time that we have a way to
allow use of -Os without any Makefile changes or other custom overrides.
Jan
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